JP5069902B2 - Mold for molding and molding method - Google Patents

Description

The present invention relates to a molding die and a molding method for molding a molded product having two or more types of shapes with one mold by exchanging inserts.

As a conventional technique related to a molding die for molding a molded product having two or more kinds of shapes with one die by exchanging the insert, there is one disclosed in Patent Document 1.
Japanese Utility Model Publication No. 6-79513

However, this technique can be sufficiently carried out in the case of molding a small component such as the connector for electric wire of the component to be molded exemplified in Patent Document 1, but if the component to be molded is large, the technology is nested. The technique disclosed in Japanese Patent Application Laid-Open No. H10-228707 has a drawback that it is not only difficult to replace the insert by human power but also dangerous.

The problem to be solved is that in a molding die for molding a molded product having two or more types of shapes with a single die by exchanging the nest, the weight of the nest increases when the part to be molded is large. It is not only difficult to change the nest by human power, but it is also dangerous. The present invention has been made to solve the above-described points.

In order to achieve the above object, the present invention
A mold for blow molding of a thermoplastic resin, wherein a rotating body having a cylindrical sliding surface is slidably mounted in a mold (main body) of the mold, Inside the cylindrical sliding surface
The main feature is that a plurality of cavity surfaces are carved.

Further, the rotation axis direction of the rotating body is orthogonal to the mold clamping direction of the molding die.
This is the second main feature.

In addition, it is slidably mounted in a matrix (main body) of a blow molding mold for thermoplastic resin, and is located on the inner side of the cylindrical sliding surface.
The rotating body of a molding die having a rotating body in which a plurality of cavity surfaces are carved.
Within the mother mold
A third main feature is that a specific cavity surface is set in the molding die to be molded by turning.

In addition, a plurality of cavity surfaces engraved on the rotating body are switched by the rotation of the rotating body, and the selection of one-piece molding or the setting of two-piece molding is performed by selecting.
This is the fourth main feature.

According to the present invention, there is an advantage that a plurality of molded product shapes can be selected and set with one mold because of having a rotatable rotating body in which a plurality of cavity surfaces are carved.

There is also an advantage that even a large and very heavy mold can be safely operated because the selection of a specific cavity surface can be easily operated and set.

To provide a rotating body with a plurality of cavity surfaces carved in a molding die for the purpose of easily selecting and safely setting a plurality of molded product shapes with one mold. Realized by.

The configuration of the present invention will be described based on the embodiments of the invention as follows. In addition, the same code | symbol as a prior art example represents the same member.

FIG. 1 is a perspective view of one of molds for blow molding showing one embodiment of the present invention. Reference numeral 1 denotes a mother die (main body), 2 denotes a bearing plate, 3 and 3a and 3b denote cavity surfaces, 4 denotes a rotating shaft, 5 denotes a sliding line, and 10 denotes a rotating body. In order to avoid crossing the lines, the cutting blades are omitted.
As shown in FIG. 1, the rotation axis direction C of the rotation shaft 4 of the rotating body 10 is orthogonal to the mold clamping direction D (vertical direction in FIG. 1) of the mother die 1.

In FIG. 1, there are two small sets of the cavity surfaces 3 and 3 a so as to form a so-called two-piece mold structure, and the cavity surfaces 3 and 3 are attached to the mother die 1. The cavity surfaces 3a and 3a are carved into the rotating body 10, respectively.

2 to 4 are perspective views taken along line AA in FIG. In order to facilitate understanding, the bearing plate 2 is shown removed from the master block 1. The rotating body 10 is separated from the mother die 1 at the position of the sliding line 5 and is separated, and is configured to be rotatable with the sliding line 5 as a sliding boundary while being supported by the bearing hole 14. .
The rotating body 10 has a cylindrical sliding surface, and is slidably provided in the mother die 1. The cavity surfaces 3 a, 3 a, and 3 b are formed from the cylindrical sliding surface of the rotating body 10. Carved in the inner part.
In the state shown in FIG. 2, the cavity surface 3b is hidden in the matrix 1 and the cavity surfaces 3a and 3a are exposed on the surface.

The rotating body 10 is rotated by human power or the like in the direction of the rotation arrow B, and a state in the middle of the rotation is shown in FIG. The rotational force required for this rotation may be applied by amplifying human power with a gear mechanism or the like (not shown), or may be electric (not shown) or hydraulically driven (not shown).

FIG. 4 shows a state where the rotating body 10 is rotated 180 degrees from the state of FIG. The cavity surfaces 3a and 3a are hidden in the mother die 1 by the rotation of the rotating body 10, and the cavity surface 3b protrudes from the surface instead.

FIG. 5 is a perspective view of one of the split molds when the rotating body 10 has completed the rotation and is in the state of FIG. 4.

In FIG. 5, since the cavity surface 3b is engraved on the rotating body 10, there is only one large set of the cavity surfaces 3, 3b, 3 so that a so-called single-piece mold structure is obtained. ing.

That is, the rotating body 10 has the cavity surfaces 3a and 3a as shown in FIG. 1 and the cavity surface 3b as shown in FIG. 5 carved at an angle of 180 degrees so as to be rotatable. Therefore, it is possible to freely select and rotate the cavity surfaces 3a and 3a and the cavity surface 3b as required.

According to the present invention, a specific cavity surface can be selected simply by rotating a rotating body engraved with two types of cavity surfaces, so that even a large and very heavy mold can be operated and set safely and easily. it can.

Next, the operation of the present invention will be described. A semi-molten thermoplastic resin parison (not shown) such as polypropylene is suspended between both molds (not shown) of the split mold, and the split mold is clamped.

The thermoplastic resin applied to the parison is not limited to polypropylene, but polyethylene, other polyolefin resins, polyester resins such as polyethylene terephthalate, polybutylene terephthalate, and polyethylene naphthalate, polyamide resins, and polyacetal resins. Syndiotactic polystyrene, polystyrene, rubber-modified polystyrene, acrylonitrile-styrene copolymer, acrylonitrile-butadiene-styrene copolymer, modified polyphenylene oxide, polyphenylene sulfide, polycarbonate, thermoplastic polyester elastomer, thermoplastic polyurethane elastomer, polyolefin Any resin that can be blow molded, such as an elastomer, may be used. Further, a composite material obtained by kneading glass fiber, carbon fiber, boron fiber, calcium sulfate powder, calcium carbonate powder and the like into the thermoplastic resin may be used.

Thereafter, high pressure air is blown into the parison and blown up to complete blow molding.

Then, the split mold is opened and released, and perspective views of the molded body 11 from which burrs and unnecessary portions are removed are shown in FIGS. 6 and 7. Reference numeral 12 denotes a parting line transfer line onto which a parting line (not shown) of the divided mold is transferred.

6 and 7, portions of the surface of the molded body 11 where the fixed cavity surfaces 3 and 3 are transferred to the molded body 11 become fixed cavity transfer surfaces 13 and 13. The portion of the cavity surface 3b transferred to the molded body 11 becomes a rotating cavity transfer surface 13b. In FIG. 6, the fixed cavity transfer surface 13 and the rotating cavity transfer surface 13b are the same. The sliding lines 5 and 5 are delimited by sliding line transfer lines 15 and 15 transferred to the molded body 11.

FIG. 6 shows the case where the sliding line transfer lines 15, 15 intersect the parting line transfer line 12 and are on both sides of the parting line transfer line 12. However, as shown in FIG. The sliding line transfer line 15 may be provided only on one side of the ring line transfer line 12. In this case, the sliding line transfer lines 15 and 15 are interrupted at positions intersecting the parting line transfer line 12 and have end points. However, the fixed cavity transfer surface 13 and the rotating cavity transfer surface 13b are different from each other. The sliding line transfer lines 15 and 15 and the parting line transfer lines 12b and 12b that divide the end points of the sliding line transfer lines 15 and 15 are separated.

In the above embodiment, the blow molding die is described as an example. However, the die according to the present invention is not limited to the blow molding die, but is an injection molding die, a compression molding die, a rotation molding die, etc. It is easy to apply to.

Moreover, in the said Example, although the example which carved two types of cavity surfaces in one rotation body was shown, it is also possible to engrave three or more types of several cavity surfaces in one rotation body. . In this case, it can be easily carried out by arranging each cavity surface at a position that equally divides one round of 360 degrees.

Further, by rotating the rotating body of the molding die having a rotating body engraved with a plurality of cavity surfaces according to the present invention, a specific cavity surface is set on the molding die. Blow molding, injection molding, compression molding, rotation molding, or the like can also be performed.

As described in the above embodiments, according to the present invention, the rotary body 10 is a two-piece mold as shown in FIG. By rotating 180 degrees, it can be transformed into a single die as shown in FIG. 5, and there is an effect that a plurality of molded product shapes can be selected and set with one die. .

In addition, even a large and very heavy mold can be easily operated and set to select a specific cavity surface, which is also safe.

The present invention can be used when blow molding, injection molding, compression molding, rotation molding, or the like is performed on two or more types of molded products with one mold.

The perspective view of one type | mold of the split mold for blow molding which concerns on this invention (before rotation of a rotary body) The figure which looked at the AA cross section of FIG. 1 (before rotation of a rotary body) The figure which looked at the AA cross section of FIG. 1 (while the rotation body is rotating). The figure which looked at the AA cross section of FIG. 1 (after rotation of a rotary body) The perspective view of one type | mold of the split mold for blow molding which concerns on this invention (after rotation of a rotation body) The perspective view of the molded object which concerns on this invention The perspective view of the molded object which concerns on this invention

1 Master 2 Bearing plate 3, 3a, 3b Cavity surface 4 Rotating shaft
5 Slide Line 10 Rotating Body 11 Molded Body 12 Parting Line Transfer Line 12b Part of Parting Line Transfer Line 13 Fixed Cavity Transfer Surface 13b Rotating Cavity Transfer Surface 14 Bearing Hole 15 Slide Line Transfer Line B Rotating Arrow
C Rotating axis direction of rotating shaft 4
D Clamping direction (vertical direction in Fig. 1)

Claims (4)

A mold for blow molding of a thermoplastic resin, wherein a rotating body having a cylindrical sliding surface is slidably mounted in a mold (main body) of the mold, mold in which a plurality of cavities face in the inner portion than the cylindrical sliding surface is characterized in that it is Ho設 The molding die according to claim 1, wherein the rotation axis direction of the rotating body in claim 1 is orthogonal to the clamping direction of the molding die. A rotating body that is slidably mounted in a mold (main body) of a blow molding mold for thermoplastic resin, and in which a plurality of cavity surfaces are engraved inside the cylindrical sliding surface. The rotating body of the molding die having
A molding method characterized in that a specific cavity surface is set in the mold for molding by rotating in the mother mold (main body). A plurality of cavity surfaces engraved on the rotating body according to claim 3 are switched by the rotation of the rotating body and selected to set a single-piece molding or a two-piece molding. The molding method according to claim 3